<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="utils/my.js"></script>
</head>
<body>

</body>
<script>
    function fn(a,b,c,d){
        console.log("fn",this,a,b,c,d);
        return 200;
    }
    // fn.bind(1,100,200)(300,400)
    const fn2 = fn.bind("abc",1,2);
    fn2(3,4);
    const result = fn2(30,40);
    console.log(result);
</script>
</html>